Heuchera plant named ‘Mahogany’

ABSTRACT

A new and distinct  Heuchera  plant substantially as shown and described, characterized by shiny, ruffled, red-brown leaves and good vigor.

Botanical denomination: Heuchera hybrida.

Variety designation: ‘Mahogany’.

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinct cultivar of Heuchera hybrida and given the cultivar name of ‘Mahogany’. Heuchera is in the family Saxifragaceae. Heuchera ‘Mahogany’ originated from a cross between Heuchera 123-1 (a proprietary unreleased plant), as the seed parent, and Heuchera 148-10 (a proprietary unreleased plant), as the pollen parent. Given its ornamental foliage and flower form it is probable that Heuchera micrantha, H. americana, H. brizoides, and H. sanguinea are in its parentage.

SUMMARY OF THE INVENTION

This new Heuchera is distinguished by:

-   -   1. Shiny, red-brown, ruffled leaves.     -   2. Good vigor.

This new cultivar has been reproduced only by asexual propagation (division and tissue culture). Each of the progeny exhibits identical characteristics to the original plant. Asexual propagation by division and tissue culture using standard micropropagation techniques with terminal and lateral shoots, as done in Canby, Oreg., shows that the foregoing characteristics and distinctions come true to form and are established and transmitted through succeeding propagations. The present invention has not been evaluated under all possible environmental conditions. The phenotype may vary with variations in environment without a change in the genotype of the plant.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a two year old Heuchera ‘Mahogany’ in bloom, growing in a one gallon container in the shade house in late spring in Canby, Oreg.

FIG. 2 shows a one year old Heuchera ‘Mahogany’ in a one gallon container grown outside all winter in early March in Canby, Oreg.

DETAILED PLANT DESCRIPTION

The following is a detailed description of the new Heuchera cultivar based on observations of a one-year-old specimen grown in a 1 gallon container in a cool greenhouse in March in Canby, Oreg. Canby is Zone 8 on the USDA Hardiness map. Temperatures range from a high of 95 degrees F. in August to an average of 32 degrees F. in January. Normal rainfall in Canby is 42.8 inches per year. The color descriptions are all based on The Royal Horticultural Society Colour Chart.

-   Plant:     -   -   Form.—Basal rosette, herbaceous perennial.         -   Hardiness.—USDA Zone 4 to 9.         -   Size.—20 cm tall from top of the foliage to the ground and             35 cm wide.         -   Habit.—Mounding.         -   Vigor.—Excellent.         -   Roots.—Fibrous, freely branching, fine, and white in color;             roots develop easily from cuttings. -   Leaf:     -   -   Type.—Simple.         -   Arrangement.—Rosette.         -   Shape.—Broadly ovate.         -   Lobing/division.—5 main lobes, with 2 to 3 shallow secondary             lobes.         -   Venation.—Palmate.         -   Margins.—Crenate and undulate.         -   Apex.—Mucronulate.         -   Base.—Cordate, lobes overlapping at the base.         -   Blade size.—5 to 7 cm long and 5 to 7.5 cm wide.         -   Surface texture.—Sparsely glandular both sides.         -   Texture.—Thin, leathery.         -   Petiole description.—6 to 12 cm long and 2 mm wide,             glandular hairs. Greyed Purple 187C.         -   Leaf color.—Spring, topside Greyed Orange 177A darkening to             between Greyed Purple 187B and Brown 200B, bottom side Red             Purple 59A; summer, fall topside, Greyed Purple 183A, bottom             side between Greyed Purple 187A and Red Purple 59A; winter             topside Greyed Purple 187A, bottom side between Greyed             Purple 187A and Red Purple 59A. -   Inflorescence:     -   -   Size.—5 to 7 cm wide and 12 to 17 cm long.         -   Type.—Thyrse.         -   Number of flowers per thyrse.—45 to 75 per thyrse.         -   Number of thyrse.—15 in spring bloom.         -   Peduncle.—About 35 cm tall, 3 to 4 mm wide at base, Greyed             Purple 187A, glandular hairs, with 2 to 4 petiolate cauline             leaves (ovate to broadly ovate, blades 3 to 6 cm long and 2             to 6 cm wide with a lobed and crenate margin, color between             Greyed Purple 187B and Brown 200B).         -   Pedicel.—Variable in size, with glandular hairs, Greyed             Purple 187A.         -   Bloom period.—Late April to June in Canby, Oreg. -   Flower bud:     -   -   Size.—2.5 mm wide and 3 mm long.         -   Description.—Glandular puberulent, ovoid.         -   Color.—Top quarter is Greyed Orange 174A, bottom three             quarters is Yellow Green 153B. -   Flower:     -   -   Type.—Perfect, male sterile.         -   Shape.—Campanulate.         -   Size.—5 mm long and 4 mm wide.         -   Petal description.—5 in number, inconspicuous, 2 mm long,             spatulate with a clawed base, reflexed, tip obtuse, margin             entire, glandular on both sides, White 155A on top side and             Red Purple 69B on the bottom side.         -   Calyx description.—3 mm long and 4 mm wide, with 5 lobes,             divided ⅓ way to the base, glandular hairs on both sides,             tip acute, margin entire, Greyed Yellow 153A on the top half             and Greyed Orange 172B on the bottom half, on both sides.         -   Stamen description.—5 in number, 1.5 mm long, filament 5 mm             long, Yellow Green 145D, anther 1 mm long, Greyed Orange             177A.         -   Pistil description.—One central two beaked pistil, 5 mm             long, Greyed Yellow 160D overall, ovary 2 mm long, each             style 3 mm long.         -   Fragrance.—None.         -   Lastingness.—Each thyrse blooms for about 2 weeks on the             plant. -   Fruit:     -   -   Type.—Two beaked capsule.         -   Size.—7 mm deep by 2 mm wide.         -   Fertility.—Good.         -   Color.—Greyed Red 182A. -   Seed:     -   -   Shape.—Linear.         -   Size.—2 mm long.         -   Color.—Black, RHS 202A. -   Disease and pest tolerance: No known resistance to rust, a common     problem with light leaf type Heuchera. Excellent disease tolerance     to powdery mildew. All Heuchera are susceptible to root weevils.

COMPARISON TO SIMILAR HEUCHERA

Compared to Heuchera ‘Black Beauty’ (U.S. Plant Pat. No. 13,288), this new variety has lighter colored foliage, between deep maroon and dark brown, rather than between deep maroon and black. The new variety has edges that are rounded or less sharply cut.

Compared to the seed parent, Heuchera 123-1, the new variety has red-brown rather than purple-black colored leaves and ruffled rather than unruffled leaves.

Compared to the pollen parent, Heuchera 148-10, the new variety has red-brown rather than pinkish-amber colored leaves. 

1. A new and distinct Heuchera plant as herein illustrated and described. 